I have for years gone to carpet shops and brought ex carpet samples in
different sizes for 50p, if you call at different carpet shops you can get a
matching set of four, I don't bother with that as I sling and replace once
a year, always looks good with new carpets once a year for £2 mostly
Hession backed or fleece , if they move I use a bit of double sided carpet
tape, mostly don't have to bother with that though.